Lister



July 7, 193.1,

wv.v H. SILVER LISTER Filed March 15. 1928 5 sheets-sheet 1 n ov w p k m www M E w m, Q. .wll/ W Q1 w July 7, 1931. W.` H. slLvR IISTER 5 sheets-sheet 2' 11112111l March 1,5, 1928 /A/l/E/VTOP 5y 4f. 6mm, JLM, ma

fram/y w. H. SILVER July 7, 1931'.

` LISTER 5 Sheets-Shed 3 Filed Marh 15 1928 m4n/nvm? W. H. SILVER July 7, 1931.

LISTER Filed March 15. 1928 5 Sheets-Sheet 4 m' ,45 f um l l s f4 TTORNEY W. H. SILVER July 7,1931;

LISTER Filed March 1.5, 192a- 5- Sheets-Sheet 5 'TIE-E /NVENTOP um w. mw, i

,4 77' OP/VE Y Patented July 7, 193i winrar. H, aILvElrn 0r@ MoLxNngILLmoIs, ass-renda. To. essere comme or MOLINE, I ILmes, sooRroR-A'rronor ILLINOIs lmerma f Appncafiqn'mgd na'mh 15, 192s, serial NQ. 'zs1,7,19.;

The present invention relates to' listers andl embodies improvements having particular yreference to threerow listers adapted for tractor propulsion.. 1

v 35 y Qneof the particular features of the invention isconce'rnedrwith the manner of supporting the listergframe on its ground wheels, and with ithe'manner4 of effecting: the depth .adjustments of' the `frame relative to said ground Wheels! The downwardly acting forces setup in the frame of a three row lister are severe, owing to the inherentA tendency of the listerplow' bottoms to run ydeeper into they soil', and tothe relatively wide spacing between the three plow. bottoms correspondying to the spacingbetweeri listing rows When it is attempted to support this frame a'. its. different depth adjustments through two `ground* wheelswhich are disp osedV outside 20 ofthe outermost lister units, the points of supportare placed soy far apart. that the aggregate suction of the ythree plow bottoms tends to ex or spring the frame downwardly in the center.. VI have:avoidedv this diiiiculty :l5 by providing ttwo ground wheels ywhich are disposed at intermediate points of the frames, c

-on oppositeV sides of thev` central lister unit.

Mechanism rvis*associated with these i'nterj miuiiateorA centrally disposed wheels-so 4that ythey will have'the'du'al function of depth'ad'' f.

justingwheels andalso of'power lift wheels.V The location ofth'ese wheelsrelatifve tofthe frame and to the'plowbottoms enables them to sustain the downwardlyactingforces withouterfwheels which are disposed outside fof the twovlateral lister Aunits inthe relation above described. Such outervwheels, however, merely" function as gaugev wheels, and

are set to conform to the depth adjustment v y p port position, thisfigure corresponding to a wardlytransverselyvof the iframe for adapt--V ing. the lim .lement to differentspacings' bef` 50 scribel,=the"fimplement comprisesy planter Aplanter drive mechanism with the raising and following .description of a preferred embodiout the possibility of the 'frame being dis-y lment ofthe invention. Inthe accompanying torted orV warped dowrnvardly'.'p.` 1 'Associated' with these intermediate Wheelsl is 'apair of f mechanism associatedwith.eachy lister jgilovv` bottom, and', irl-'this regard, itis a further objecty of the invention to so Vco'ns'tru'ctthe driving mechanism for the three planterdevices that thisinwar'd or outward shifting of the two outer lister-'units rcan be readily accomplished without disturbing the driving relations to the planter mechanisms and with.- out necessitating extensive changes in the vdriving ymechanism to accommodate" Vsaid shifting of the lister units. Y' n A further objectof the invention'is to4 providev a three row lister in which the three lister unitsv are substantial duplicates, thereby avoiding thenecessity of special constructions in the case of one or more ofthe lister units, and hence reducing the cost of the implement( lFurtherobjects are to provide lan 'improved meansfor stopping and starting .the

lowering ofthelplow bottoms between their inoperative andoperative positions; to provide improved ineansfor taking slack out of thedrive chain .which transmits 'power from one of the intermediate supportingwhcels to the planter drive shaft, .whereby vthe chain, y is made, to'accommodateautomatically a variable spacing which Voccurs betweenA said 'supporting wheel `and thenplanterv drive shaft l Y a'svthe implement is raised land'lowered to v`different positions; v and to improve upon the construction yof these implements in other particulars, as 'will hereinafter appear-in the Figure 3 is alongitudinal sectional view showingv the implement raised to its transysection taken approximately on theplane of the line 3 3 Vof Figure l.V l y y Figure lis a longitudinal sectional .view

taken approximately on the plane ofthe line .Y

444, Figure 1, and illustratingthe chain drive mechanism y'between ,one ofthe intergv Y' mediate wheels and the lplanterV drive shaft. 100

9o y j Figure 5 is a plan View of this part of the structure.

Figure 6 is a detailed sectional view of the clutch mechanism for automatically interrupting the planter drive when the implement is raised to transport position.

Figure 7 is a fragmentary side elevational view of the power' lift wheel.

Figure 8 is an axial sectional view through this wheel and through the clutch mechanism associated therewith.

Figure 9 is a detail view showing the adjustable relation between outer lister units and the front frame bar; and,

Figure 10 is a similar view showing the adjustable relationl between the outer lister Aunits and the rear frame bar.

The three lister units, designated in their entireties A, B and C are preferably disposed in transverse alignment, and are connected to, or form a part of, a main frame designated 14 in its entirety. This frame comprises a transversely extending front frame bar 15, a similarly extending rear frame bar 16, and two longitudinally extending frame bars 17-17. The rear frame bar 15 preferably consists of two bars bolted together for additional strength, and the longitudinally extending frame bars 17-17 `have their rear ends bent outwardly for bolting to the frame bar 16, vas indicated at 18 in Figure 1. As shown in Figures 2 and 3, the front frame bar 15, which is preferably an angle section, is disposed in a lower Aplane than the rear frame bar 16, and the longitudinally extending frame bars 1.7 extend forwardly over the front frame bar in spaced relation thereto. Angle brackets 19 are bolted to the sides of the longitudinal frame bars 17 and extend downwardly for bolting to the horizontal flange of the front frame bar 15. The forward ends of the longitudinal frame bars 17 are converged and are secured together by bolts 21 between two plates 22 which form a draft attachment for the front end of the implement. The plates are of angular form, and the vertically extending portions thereof are spaced and are provided with aligned holes 23 for receiving at different heights a coupling pin 24 through which draftconnection may be made in a well known manner with the tractor 25. Referring to Figure 1, two diagonal brace or links 26-26 are secured at their forward ends to the outward sides of the plate and extend rearwardly and outwardly for attachment to the underside of the front frame bar 15, preferably at points adjacent to the outer ends thereof.

Each lister unit A, B and C comprises a plow beam 27 having secured to the downwardly curved standard portion 28 thereof a lister plow bottom 29. The beams and plow bodies of the three lister units are all substantial duplicates, andthe three beams make up a part of the implement frame 14. The downly inclined front ends of the beams are secured to the front frame bar 18 by angle brackets 31. As shown in Fig. 1, the beam of the intermediate unit B is secured to the frame bar by arranging such angle brackets on opposite sides of the beam and bolting the same to the beam and to the frame bar, and the beams of the two lateral units A and C are similarly secured to the frame bar by bolting this same form of bracket to the inner side of each beam and to the frame bar. Referring to Fig. 9, it will be seen that the bracket 31 of each lateral beam is secured to the front frame bar 15 by two bolts 32 which pass through holes 33 in the vertical flange of the frame bar. There are a considerable number of these holes 33 placed equidistantly along each end portion of the frame bar, so that the points of attachment of the front ends of the lateral beams can be shifted inwardly or outwardly in adapting the implement to different spacings of the listing rows, the construction shown illustrating the required number of holes for obtaining four different adjustments of each lateral plow beam. a

Referring to Figures 2 and 10, the rear portion of each plow beam is secured to the rear frame bar 1G by a. pair of angle brackets 34 which are bolted to the opposite sides of the horizontal portion of the plow beam and eX- tend rearwardly in prolongation thereof. The outwardly bent ends of these brackets are secured to the frameA bar 16 by bolts 35. As shown in Figure 1G, the end portions of the frame bar 16 are provided with a plurality of equidistantly placedholes 36 for receiving these bolts 35, so that the rear ends of the two lateral beams can be shifted inwardly or outwardly to-correspond to the settings given the front ends of the beams.

Thetwo intermediate wheels previously referred to areindicated at 38 and 39,'these wheels being located between the sides of the frame and substantially equidistantly be'- tween the centra-l lister unit B and the two lateral units A and C. Such wheels are mounted on the crank ends 42 and 43 of a crank a'Xle 4l which has bearing support in brackets 44 extending downwardly from the two longitudinal fra-mebars 17 see Figures 2 and 4). These wheels serve to lift the entire frame bodily to transport position (Figure 3) and to adjust the depth of plowing; the wheel 39 at the right hand side also serving to transmit ai drive to the planter mechanism associated with each lister unit, as will be presently described. The power lift mechanism and the depth adjusting lever are associated with the left hand wheel 88, the power lift clutch being of a standard wellknown construction (Figures 7 and 8)y and hence it will not be necessary to describe this lift clutch in detail. It will sulficeto say that 1Macc? formed with coaxial sleeves-,which have hearing Supporto the axle 42; The driving clutch element is bolted to 'the Wheel 38` to rotate therewith;V and is-adapted vto trans.- mitrotat-ion -t'o the driven clutch element 47 through the instrumentality of a roller 48 which is adapted to movey into'amdont of engagement with notches' '49 'formed internally f inthe driving clutch element., The roller 48 Clutch., :The khalf remhlton of thedriveny is mounted on Vthelpiiot of two connected v.links illustrated in dotted lines in Figure 7,

which links have operative connection .with diametrically opposite dogs lrot'atably supportedinthe outer side wall of the-driven .clutch element 47; Spring/means connected withy the aforesaid links' normally-tendsto swing the roller. 48 out into clutching engage.- ment with the notchesr 4 9, such tendency of the spring being overcome when one ofthe tripping dogs 51 is engaging a roller 52 which l is mounted on the lower end of a tripping-- lever 53. v Such lever `is pivot/ed at 54 ,to an arm. .55 which is clamped to and extends downwardly fromfthe upper portion 4of the crank axle 41. A tension spring 56 has itsV lower end attached to the tripping lever 53,

at" a point abovev the pivot 54, andfhas itsupper lend connected to :1 -'hook eitension 57 (Figure 3) projecting from the upper' clamping portion of the arm 55. The tendency of this spring is normally to swing the roller 52 into thepathpof one or lthe other of theftripping dogs 51 for'holding thelift clutch disengaged. The upper' end 0f thev lever .53 has connected yto it it rope `5,8 which Ileads vforwardly to a, point klimt-tothe operators Seat on y,the tractor--Zian'd -it will4 be evident that by jerking on this rope the operator .can disengage the r01'lerf52 from .the tripping dog 51 with which itv is theniengaging, thereby resulting ina half revolution of? the driven clutch element 47, or until the other: tripping ldog 51 enga-ges the; roller 52 and releases-.the

. ,clutch element is operative to raiseor lower the implement through liftinglink ory bar 59 rwhich ispivotally connected at itslowel' end .tot pivot st-ud 61 projecting-'outwardly from the side ofthe-,driven clutch' element. Referringto Figure 3, the upperend ofsad lifting bar is pivotally connected at 62- to aj depthadiusting lever 63 adapted to he Ina-I1'.- uelly operated .from-the dri-verts position on the tractor The rear-end of the adjusting lever 63 is pivoted at 64 toal bracket .6,5 which is rigidly secured to the adjacent longitudinal frame bar 17, thefdownwardlycurved forward pertion oft the bracket t5 having quad,-

Y runt: notches *66 ,formed thereinfor receiving 'a Well known type; .of lstchingzdeg. creamed on theladjusting lever f Y f e5 Y. n eine@ evident nome@ wegging-ein' by merely milling-i,onA the-trip rope 58 the -operaitorcan fraise the implement to transpol't positiomor cal-nlower it to plowing posi'- tiOIL The rotation of the crank pin 61 will rec tthrongh the lifting bar 59, the upper,

ly,L depending uponwhich halfof the. cycle .the driven vclntchfmember is operating in. The concurrent `swinging movement of'both Wheels 38 vand 39 willthus raise or lower lthe implement in an obviousV manner. e When the `operadory desires to. adj ust the depth of penetration of thejplow bottoms he merely swings l.the adjusting lever 63 either .ujmrardlyor downwardly, and this operates through the liing bor -59'to swing the crank akle 41 :and thetwo wheels-38 and 39 either upwardly or downwardly forfsec-uring fthe, desired depth adjustment. "The rclatching of theadjnsting lever 63 to its' quadrant 66 locks the vpivot Apoint :62 in stationary relation for any subsequent lifting and lowering operations effected bythe power lift clutch'vii. The

Weight oflethe implement frame'andof the A ploWS etcotera,' :is counterbalanced :to .some extent by a tension spring 68 which isfcon.- nected at its front -endto a tie 'rod '69 having iidjusteble nttachmenttovthe' front portion 'f f ofthe fram@ theii'ea'r `end of thenspringS being coupled to an erin 'Il extending upwardly Vfrom :env-elbow bracket 72l secured tothe .crank axle 4l. Disposed beyond the ySides of thefrome' are gauge fwheelsfll-I/l `which are-mounted on' the spindle-,portions of-crank axles -7 5. Theupp'er. end of each crank axlel 75 hasbearing ysupport in two theV angle-brackets; 34 on opposite; sides ,of the 'plow bearn ofthe/outer'listerv unit,the

tween said bearingk brackets below the rplofvv beam.v Y The journal portion. of each jcrank Lxle has a sleeve 77 rotatablyisup-ported thereon` and ,thejgaugefwheel '174- isr adjustable lengthwise lalong this be erin sleeve for v skein', in order to permit inwardior outward shifting of the two gangewheelsto adaptthe imple- Inent to ydifferent speci-rigs betweenthe listing rows. ,The geugewheel isgheld in anyshilted' position along l the sleeve 77 by` a suitable Set' screw, and thesleeve.'maybe provided with a 'ribV or spline 78l engaging in a`corresponding key Way in the hub of the'wheel to compel the rotation ofi the v sleeve i with the wheel. vErich ofvthese outerlwheels is provided with al1-independent adjusting lever 7 9 z whichl ispivotell'y,connected at 8l: to a :hitchbear-ing brackets '76?? 6 whicham bolted to Ldo n' j ing quadrantk 82se`curjed to the sideyotthey .plow beam 2710i the adjacent listerpunit. The lever is providedI with Ythe asual latch quadrant, and has pivotal connection with the adjacent crank axle 75 through a link 84 (Figure 2). The upper end of this link is pivoted on a pin 85 which extends from the sidel of the lever 7 9 and has its outer end supported in a strap 86 spaced outwardly from the side of the lever. The lower end of the link 84 is coupled to a collar 87 which is clamped to the forwardly extending portion of the crank axle. It will be evident that by swinging the two levers 79 79 upwardly or downwardly the two outer wheels 7 4-74 will be correspondingly raised or lowered and will be held at any fixed setting given the levers 79. These outer Wheels merely function as gauge wheels, as for the purpose of leveling the plow and maintaining the same at the proper balance, it being understood that the desired depth adjustment is first established by adjustment of the two intermediate wheels 38--39, and that thereafter the gauge wheels 7 4-7 4 are set to conform to this desired depth adjustment. At,- tention is directed to the fact that each outer wheel 74, together with its crank axle 75 and adjusting lever 79 is mounted as a unit upon the plow beam of the adjacent lister unit, so that in any inward or outward shifting adjustment of the lister units, transversely of the frame, the gauge wheels will be shifted directly there-with and there will be no necessity of disassembling or modifying the relation of the gauge wheels with reference to the implement.

`Associated with each lister unit is a planter mechanism comprising a mounting bracket 89 on which a seed hopper 91 is supported. The seed is discharged from the hopper through the operation of a conventional seed plate or other feeding mechanism to aseed spout 92 extending ownwardly and rearwardly of plow body 29 for dropping seed into the list-er furrow opened by the plow. The spout 92 is carried in a bracket 93 consisting of a pair of spaced attachment plates bolted to the opposite sides of the plow beam standard 28. The rear end of the bracket 93 may be arranged to carry any desired combination of covering discs or shovels 94; for turning the soil back into the furrow over the seed. The upper mounting bracket 89 of each planter mechanism is bolted or other- Wise secured to a mounting plate 95 which is adapted to receive the two bolts 35 which secure each plow beam to the .rear frame bar 16. When the two lateral lister units A and C are shifted inwardly or outwardly, as previously described, the two mounting plates 95 associated with these lister units are shifted along with the bolts 35 so that the planter mechanisms of these two lister units are shifted correspondingly with the units.

The feeding plates of the three hoppers 91 are all driven from a transversely extending drive shaft 96 which. extends through a lateral lister units 'A and C are shifted in-V wardly or outwardly to adjust the row spacing the planter mechanisms of these units slide lengthwise along their respective shaft sections 96n and 96C, provision being made for permitting this sliding adjustment lwithout interrupting the drive to the feeding plates of these planter mechanisms. i

Referring to Figures 4 and 5, the shaft 96 `driven from the wheel through a chain 101 which passesover a sprocket wheel 102 on said ground wheel, and over a sprocket wheel 108mounted on the planter drive shaft. The chain isen'closed in a shield or guard 104 which is supported at its lower end on the spindle portioni of the crank axle 411. The upper end of the shield is provided with a relatively long slot 105 through which the drive shaft 96 extends, this slot being necessary to permit of the endwise shifting movement ofthe upper end of the shield incident Y to raising and' lowering movement of the implement, since thev crank axle l1 swings about a' center which is disposed below and forwardly of the axis of the drive shaft 96. To accommodate this eccentricity of swinging movement vof the driving sprocket-wheel 102 with respect to the driven sprocket wheel `103 I have' providedresi lient means coacting with the chain 101 for taking up slack from the chain as the sprocket wheels approach u each other and for supplying an additional amount of chain as the sprocket wheels recede from eachother, this resilient means also tending to' retain the drive chain taut at all times andv thereby taking up wear in the chain. Such resilient means comprises a plate .106 which is pivoted substantially at its center on a pivot bolt 107 mounted in the shield 1041, the plate being disposed on the outer side of the shield. this platecarry pivot studs which extend into the shield through arcuate slots 108 which are curved concentrically of the pivot bolt 107. Mounted on these studs within the shield are rollers or sheaves 109-109, and the lower flight of the chain is trained upwardly over the upper roller 109 and down under the lower'roller109. A link 111 is pivotally connected to the upper portion of the plate 106 and is attached to atension iis The two arms of j izo spring 112, the other end of which is conica side of theshield 104. The tension ofthe' spring 112y tends constantly to swiiig" the rollers 1U9f-'1O9 in a vdirection to maintain' the drivey 'chain 'Linder resilient" tension whereby-the eiiective length of the fcliai'n *beg tweetlietwo sprocket Wheels102'- andv 103 will increaseaiid diminishy as thev sprocket `Wheels separateor 'move towards ea'cli'v other.

Attention is "directed tor the fact-that 'the drivin-g energy is transmitted 'tliroiigh the upper iightof the chain, andhefnce the re'- silient "tension imposed on Athe lower i'etiiiin Hight thereof will not affect the driving rela;

tion.' l/Vihen it is desiredgto change the drillf ing'dist'ances of the `Seed the feec'ling plates g l n l the two clutch parts are permitted to engage.

The opposite end of the yoke mernber is made;

in the bottemsef' the hopper-S191 may Sub; stitrted `by plate'sha'ving a greater4 or lesser nn'inber of cells; and, to the end ofproviding laan additional adjustment for these drilling' distances 'I have finade proyisionor lsiibsti- `tilting the driven sprocletwheel 103 by larger or sinaller sprocket 4Wheels.y fr 'varying'theI speed of rotation of the planter*drive shaft 96.v It Will be'evident that lthe' action of 1the rollers 109;#109 in; taking up or letting 'ont a portion of the `drive ychain '101Will pe';`r'init'-y of* thisl substitution 'of'thefspiocket Wheel 103 Withoiit nec'essitatin'g` vany adj'iis'tinent' of" the v4parts.

Referring to theclutch vine ans which is pro-y vided for 'automatically interrupting thel drive to the planter shaft 96'Whje'n the iinple ment 'is raised to transport position, it will be Y'seen from Figure" 6 that the driven sprocket Wheel 103 isv 'rotatably mbi'iited onthe shaft! sectiol'i96'15 and has a hub portion lextenc'ling from one side thereof, 'in `which areforme'd jaw'teetli 115. These'javv teeth are. adapted to engage' with cooperating metil-116v formed on one end of af'shiftablecl'tcli sleeve 117;

YThe otherendcf said sieeve'sofrmed with a polygonalsocket 1118 which' engages `sfli'dably lbiitnon-rotatablyIovera polygonal head or i yiian'ge formed on the end `of' a sleeye 119'Wlhich is bolted yor keyed tothesh'aft'sectioii 96h. A

reacts' against theY sleeve 119 for normally' holding the clutch tee^th1115 116 in driving engagement. The other end of thesleevejy 119 is formed Withf a polygonal exterior vwhich lits 'loosely' in *a correspondingly socket in the end of the couplingmeinber. 99

which is secured to the shaftse'ction 96C; ythis" coupling member' ,permitting disalignrnent of the latershaft section With respect tothe" shaft section 961 but compelling joint rotation ofboth shaft sections. HThesprocket Wheel:

103 is heldqagainst shifting along thesliaft section 961 by a bear-ing hub123'againsttlie end of'which the sprocket wheel bears. AThis' hubl is formed 'onZ an :armir 124 vvhich is ilXed'ly' secnred to the inner-side 'of thereaizframebai 15. The elongated'slot 105i in the shield 104 slides' on the outer `surfac'eof the bearing hub 123'. A e

' Disengagement of the clutch ,is eifecte'd by i a reciprocating yoke 126 in the form 'of a long linkliaving a longitudinally extending slot therein which slides upon tlietvv'o elements of the vclutch directly over-the Iclutch teeth. V

The yoke is confined between the flange 127 on the' r'cliit'ch sleeve 117 and a laterally thrust-y ing yspring plate Vor Washer 128 which bears against a shoiilder on the llnib of. the sprocket IThe lower or forward end ofthe yoke member 12'6is` made comparativelynar-V comparatively vvifde in thissame' dimension` so 'that when thispotion ofthexyoke member is i thriist forwardly between 'thefiange`127 and spring plate 128y the two'clutch parts 'are forced 4apart for releasing the clutch. "The top and bott-0in portions of the yokel member are formed with ysloping cam 'surfaces-129' 'on one side thereof between the Wide and narrovv portions of the yoke, and these cam, 'snr'faces thrust laterally against theiang'e" 127 for releasing the clutch Whei tlieyokev member ifs moved frfr'iv'ardly as above described'. 'Snell movement? of the yoke r1`I11l1b`er is niadfe to ooi cui when me implement is raised fio-transport position through the sivingirrgivenrent `ofa crank' link 'f'lever' 131 'which has piti/etal' shifter' yekeiee. vThe ether am' er geen ley-er. fis `r')ivMailly connected at 'I3/42 tof asieeve which' is rnountedona rod 136;; Referrngto `Figure y5, Yity 7Will befseeri thatf'the front' end of' this rco is 'bentriaferany for making' piv'pmi connection at '137 WithA the arrn 71'" which Swings withth fain; me 41.'- ronise is arranged tov glie-e' freely the Steeve 13el aad tassiisprojvecting wrend nreaded for receiving e @heeded @faire ori-iur 13e :ing the adjusting @anales downwardly Y along f eiered lthey Sleeve 135l Lwin be shifted :it being anderem@ ihaethie f'eieusei'of the no clutch should not occur while the implement is being adjusted between any of its working positions. It will be noted that as the yoke member 126 is being moved forwardly or backwardly it is free to swivel or rock around the annular surfaces of the clutch elements whereby the arcuate movement of the lever 131 is accommodated.

It will be seen from the foregoing that the present construction affords an arrangement of wheel supports which relieves the frame from distorting stresses, and which also results in an even running implement. Such will be apparent from the fact that by disposing the two intermediate wheels 38 and 39 in close proximity to each of the plow bottoms, and by establishing the depth adjustment of the implement through these wheels, all parts of the frame, and particularly the intermediate portion thereof, are well supported to carry the downwardly acting stresses of the plows. As before remarked, the two gauge wheels -l serve to level the plow or to maintain the same in properly balanced relation with reference to the ground.

I claim:

1. In a lister, the combination of a frame, a plurality of plows carried by said frame, a supporting wheel disposed between the sides of said frame for normally supporting the frame between the sides thereof, power lift mechanism cooperating with said wheel for raising said frame, depth adjusting means connected with and operative through said wheel for establishing the depth adjustment of the implement, said wheel having frame supporting contact with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the different Adepth adjustments, and a pair of gauge wheels at the sides of said frame for leveling the plows and maintaining the same at the proper balance.

2. In a lister, the combination of a frame, a plurality of plows carriedthereby, a crank axle carried by said frame, a supporting wheel mounted on said crank axle for normally supporting the trame between the sides thereof, power lift mechanism cooperating with said wheel for raising said frame, depth adjusting means operatively connected with said wheel and coacting therewith for establishing the depth adjustment of the implement, said wheel having frame supporting Contact `with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the different depth adjustments, a pair of gauge wheels at the sides of said frame for leveling the plows and maintaining the same at the proper balance and means for adjusting said gauge wheels vertically relatively to the frame.

3. In a lister, the combination of a frame,

, a crank axle carried by said frame, supporting wheels mounted on the respective spindle portions of said crank axle and located between the sides of the frame for normally supporting the trame between the sides thereof, power lift mechanism associated with one of said wheels for raising said frame, depth adjusting means connected with one of said wheels and coacting therewith for establishing the depth adjustments of the implement, said wheels. having frame supporting contact with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the different depth adjustments, a pair of gauge wheels at the sides. of said frame for leveling the plows and maintaining the same at the proper balance, and means for adjusting said gauge wheels vertically relatively to said frame.

4. In a lister, the Combination of a frame,

a plurality of lister plows carried by said Y frame, a crank axle carried by the frame intermediate the sides of the latter, supporting wheels mounted on the respective spindle portions of said crank axle between the sides of the frame for normally supporting the frame between the sides thereof, power lift mechanism operatively connected with one of said wheels for rasing said frame through swinging motion of said crank axle, a depth adjusting lever operatively connected with one of said wheels for establishing the depth adjustment of the implement through swinging motion of said crank axle, said wheels having frame supporting contact with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the diierent depth adjustments, a pair of crank axles mounted at the sides of said iframe, gauge wheels journaled on the spindle portions of said latter crank axles for leveling the plows and maintaining the same at the proper balance, and adjusting means operatively connected to said latter crank axles for adjusting said gauge wheels vertically relatively to the frame.

5. In a lister, the combination of a frame, a plurality of lister plow bottoms carried by said frame and spaced laterally from each other transversely across said frame, a crank axle pivotally mounted on the rear portion of said frame intermediate the sides thereof, a pair of supporting wheels journaled on the spindle members of said crank axle and disposed between the sides of said frame for normally supporting the frame between the sides thereof, power lift mechanism associated with one of said wheels for raising said frame, said wheels having frame supporting contact with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the different depth adjustments,

la plurality oflister plow bottoms carried by said frame and spaced laterally from each other transversely across the frame, a crank aXle pivotally mounted on the rear portion of said frame intermediate the sides thereof, a pair of supporting wheels journaled on the spindle members of said crank axle for normally supporting the frame between the sides thereof, a power lift clutch comprising a driving clutch element connected to one of said Wheels and a driven clutch element -adapted to be driven thereby, said wheels having frame supporting contact with the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows in the different depth adj ustments, a lifting bar operatively connected with said driven clutchelement,depth adjusting means operatively connected with said lifting bar and effective to establish the depth adjustment of the implement through said bar, a pair of crank aXles pivotally mountedv at the sides of said frame, gauge wheels journaled on the spindle members of saidlatter crank axles for leveling the plows and maintaining the same at the proper balance, and adjusting means connecting withv said latter crank aXles for adjusting the gauge wheels vertically relatively to the frame.

7 In a lister, the combination of a frame,

a plurality of plows carried by said frame, a

wheel mounted on said frame intermediate the sides thereof for normally supporting the frame between the sides, depth adjusting means operatively connected with said wheel support for establishing the depth adjustment of the implement therethrough, said wheel having frame supporting Contact with the ground and bracing the framebetween the sides against downward Vstresses resulting from the, action of the plows in the different depth adjustments, and a pair of vertically adjustable gauge wheels mounted at the sides of said frame for leveling the plows and maintaining the saine at the proper balance.

8. In a lister, the combination of a frame, a wheel disposed between the sides of the frame for normally supportingthek frame between the sides, said wheel having frame supporting contact with the ground and bracing the frame between the sides against downwardjstresses resulting from they action Y of the plows in the different depth adjustments, three lister units spaced transversely across-theframe, each of said units including a lister plow vertically adjustable gauge wheels mounted on the two lateral units for levelin-gthe plows and maintaining thesanie at. the 4properl balance and means adjustably attachingthe two lateral units to said frame for permitting inward or outward shifting ofy said lateral units relatively to ythe intermediatev unit to. vary the spacing between the lister rows, said gauge wheels andthe planter'mechanisms' associated with said lateral units bei-ng movable bodily with said units in the shifting adjustment thereof, and said-planter mechanisms remaining in operative'relatiOn to said driving means in the different shifted positions of saidunits.

9.' In a lister, the combination of a frame-,1

threelister vplow units spaced transversely across' said frame,y a crank axle.. pivotally y mounted Vsaid frame intermediate the sides thereof, a' pair of supporting wheels join"- nal'ed on the spindle members of said' crank aXle intermediater the sides ofsaid frame for normally"supporting the frame between the sides thereof, power lift mechanism cooperating with one of said wheels for raising said frame, said whe-els liaving'frame supporting contact 'ith the ground and bracing the frame between the sides against downward stresses resulting from the action of the plows iny tlie'diiierent depth adj ustments,depth adjusting means `operative to swing said crank Vaile Vfor establishing the depth adjustment of the implement, crank .axles pivotallyv mounted on the two outwardly disposed plow units, gauge wheels j ournaled on the spindle members vof said latter crank axles for leveling theplows and maintaining the saine at lll() the proper balance, adjusting means carried f on said outwardly disposed units for adjusting said gauge wheels vertically relatively f to the frame, and means adj ustably attaching said outwardly disposed units to said frame for'permitting inward or outward shifting ofsaid units to vary the spacing between the lister rows, the associated crank aXle, gauge wheel and adjusting means being carriedV bodily by each outwardly disposed unit in suoli lateral adjustment.

Y l0. In a lister, the combination of a frame, a supporting wheel disposed between the sides of said frame, power lift mechanism. cooperating with said wheel for raising said frame,

depth adjusting means connected with and operative through said wheel for establishing the depth adjustment of the implement,

and a pair of gauge wheels at the sides of' said frame, said gauge wheels being positioned in substantially transverse alignment with said supporting wheel.

1l. In a lister, the combination of a frame,

a plurality of plows carried thereby, a crank aXle Carried by' said frame, a supporting Wheel mounted on said @rank aXle, power lift mechanism cooperating With said Wheel forraising said frame, depth adjusting means operatively connected With said Wheel and Coacting therewith for establishing the depth adjustment of the implement, a pair of gauge Wheels positioned at the sides of the frameand normally disposed in substantially trans w verse alignment With said supporting Wheel, and mea-ns for adjusting said gauge Wheels vertically relatively to the frame.

12. .ln a lister, the Combination of a frame, av plurality of plows carried by said frame, a Wheel supporting means mounted on said frame intermediate the sides thereof, supporting wheels carried thereby7 depth adjusting mea-ns operatively connected with said Wheel supporting means for establishing the depth adjustment of the implement therethrough, and a pair of vertically adjustable gauge `Wheels mounted at the sides of said frame in substantially transverse alignment with said supporting Wheels. ma In Witness whereof, I hereunto subscribe my name this lst day of March, 1928.

WALTER H. SILVER. 

